#1 Wire Not Sending Spark at idle - Page 2 - Chevelle Tech
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post #16 of 22 (permalink) Old Nov 23rd, 13, 3:19 AM
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Nick
 
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Re: #1 Wire Not Sending Spark at idle

Quote:
Originally Posted by Schurkey View Post
If it has too-LOW resistance--specifically, if it provides a reasonable path to ground, the coil will never build voltage because the current will just bleed off.

The plug has to have an open-circuit (specifically, a gap) that current can't bridge until the voltage is high enough to ionize.
Wide gapped plug = high resistance
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post #17 of 22 (permalink) Old Nov 23rd, 13, 10:13 AM
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Re: #1 Wire Not Sending Spark at idle

Take wire AND plug from #3 and put them on the #1 rotor cap tower to cylinder. If triggers the light look no further
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post #18 of 22 (permalink) Old Nov 23rd, 13, 11:43 AM
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Re: #1 Wire Not Sending Spark at idle

Quote:
Originally Posted by nsnarsk View Post
Wide gapped plug = high resistance
Any-gapped plug = high resistance until gap is ionized by voltage. Larger gap requires higher voltage to ionize.

But the point is, it doesn't matter what the gap is if the porcelain is covered in material that conducts electricity, so the current drains down the conductible coating instead of jumping the ionized gap. That's a fouled plug.

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post #19 of 22 (permalink) Old Nov 24th, 13, 6:53 PM Thread Starter
 
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Re: #1 Wire Not Sending Spark at idle

alright everyone - so the final results are in
#1 not firing -
diagnosed down to ignition issue
replaced cap + rotor = no fix
swapped wires around = no fix
propane torch on the plug + good cleaning = fixed - had only (2) slight mis-fires on a (30) minute hard test drive up hills with rpms up to 5k - but I think due to wire being a little loose - pulled in and heard a ticking - checked and found wire fell off - re-snugged wire - back on road no mis-fires

Thank you guys - really appreciate everyone's help

Dave - do you recommend I know put in a new plug and save the old one for beating up ?
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post #20 of 22 (permalink) Old Nov 24th, 13, 7:37 PM
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Re: #1 Wire Not Sending Spark at idle

You just proved Schurkey's explanation, he was dead on. Probably a good idea to replace all plugs.

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post #21 of 22 (permalink) Old Nov 24th, 13, 7:59 PM
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Gary
 
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Re: #1 Wire Not Sending Spark at idle

i assumed when you replaced the secondary ignition for #1 on cyl 1 you replaced the plug too. i thought it actually wasnt firing on cyl #1.thats my fault.what light do you have.even with the firing voltage reduced a bunch my snap on light and others i've used will trigger with the wire grounded
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post #22 of 22 (permalink) Old Nov 25th, 13, 8:40 PM Thread Starter
 
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Re: #1 Wire Not Sending Spark at idle

a cheapo sunpro - I snagged from my buddy - he wouldnt let go of the snap-on ones - fricken snap on hoarders - holds on to them harder then his women
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